People began to communicate with distant tribes. Land was cleared for roads. Foreign plants and animals were transported to places where they had not existed before. Specialization also give people more free time. So art ,dance and music became important ways of expressing feelings and thoughts. This was how many great civilizations started.

　　Compared to the past, modern civilization has experienced many changes to become the highly developed society that exists today. Populations have increased rapidly. Forests have been cleared for farms. Inventions and technology have made work easier.

　　However, pollution and other serious problems have also resulted from human progress. As concerned citizens, it is up to us to learn from past mistakes and to help maintain and improve our environment.

　　1 Early tribes didn’t have much effect on animal population because_____

　　A .they kept animals for themselves

　　B they ate only vegetables

　　C they loved animals

　　D they killed only enough for food

　　2 The main purpose for small clans to join together was_____

　　A to hurt animals

　　B to seek safety

　　C to share caves

　　D to protect environment

　　3 According to the passage ,we can learn that_____

　　A early people moved to new places looking for new sources of food

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